... series, 6800 series, 6900 series, etc.2.Angular contact ball bearing: 7100series, 7200series, 7300series, 7400series, etc.3.Taper ... roller bearing: N series, NU series, NJ series, etc6.Pillow block bearing: UC series, UCP series, UCF series, UCFL ... series7.Self aligning ball bearing: 1200series, 1300series, 2200series, 2300series Ring MaterialChrome Steel ,Carbon ...